Alera Elusion Series Mesh Mid-Back Swivel Tilt Chair, Black: Ergonomic design adjusts to fit multiple users Contoured seat cushion with a waterfall edge to help relieve pressure on legs Height- and width-adjustable arms with soft polyurethane pads Alera office chair has a 5-star base with casters for easy mobility Height-adjustable ratchet back for optimal lumbar support Overall dimensions: 36.63-42.88"H x 25.63"W x 26"D Seat dimensions: 20.5"W x 21"D Back dimensions: 20.13"W Weight rated up to 250 lbs. Meets or exceeds ANSI/BIFMA standards Model number: ALEEL42BME10B Available colors: black and black/white Adjustable tilt angle and tension